Adjustable toolholder



June 20, 1950 A. THOMAS 2,511,884

ADJUSTABLE TOOLHOLDER Filed Aug. 2a, 1946 s Sheets-Sheet 1 .INVENTOR. Jfllbert Thomas ATTO RN EYS June 20, 1950 A. THOMAS ADJUSTABLE TOOLHOLDERs Sheets-Sheet 2 Filed Aug. 28, 1946 INVENTOR. fllbeI-t Th omasATTORNEYS June 20, 1950 THOMAS 2,511,884

ADJUSTABLE TOOLHOLDER Filed Aug. 28, 1946 3 Sheets-Sheet 3 r im Emfllberjiii- 759F105 v [ATTORNEYS Patented June 20, 1950 UNITED STATESPATENT OFFICE i 2,511,884 ADJUSTABLE TOOLHOLDER Albert Thomas, Munhall,Pa.

Application August 28, 1946, Serial N 0. 693,417

14 Claims.

This invention relates to adjustable tool holders and has for itsgeneral aim and purpose to avoid the complications of prior devices ofthis kind and providesimply constructed and easily operable means foraccurately adjusting and rigidly retaining a cutting or boring tool in apredetermined radial setting relative to the axis of a machine spindleor chuck and the work.

One of the important objects of theinvention resides in provision ofmeans'for adjusting the tool holding member radially of the axis of adriving member together with means connecting said members for relativeradial movement and directly coacting with said tool holding member toprevent rotary movement of the latter during adjustment thereof andmaintain a constant angular relation of the tool to the work in alladjusted positions thereof.

A more particular object of the invention is to provide a key mounted inthe driving member and having means directly transmitting driving torqueto the tool holding member independently of the adjusting means.

Another object is to provide novel adjusting means embodying a splitexpansible bushing rotatable in a socketed end of the driving member andhaving a tapered eccentric bore receiving a similarly tapered part ofthe tool holding member, together with means for adjusting said bushingand frictionally locking the same to said member and the wall of thesocket to retain the tool holding member in eccentrically adjustedrelation to the driving member.

A further object of the invention is to provide a novel cooperativeassembly of the driving and tool holding members with the adjustingbushing so that the adjustment of the tool holder with respect tothedriving member will not be disturbed or changed by torque stresses inthe operation thereof.

It is an additionalobject to provide eccentric adjusting means for thetool holder which is so constructed that maximum efficiency is attainedand certain inaccuracies characteristic of tool holders of this type asheretofore suggested are substantially eliminated.

Another important object of the invention is to obtain complete rigiditybetween the driving and tool holding members and in one of itsembodiments the eccentric locking bushing is provided with relativelyexpansible and contractable end portions one of which is expanded tofrictionally grip one of said members while the other end portion iscontracted to frictionally ment of said bushing.

A still further object resides in the provision of means adjustablymounted in the driving member and coacting with means on the toolholding member to prevent rotary movement of the latter andsimultaneously axially move said member and the adjusting bushingtherefor into rigidly locked relation with said driving member.

The invention also contemplates an adjustable tool holder as abovecharacterized comprising a minimum number of durably constructedelements, in which all cylindrical surfaces of the driving and toolholding members are concentric with their respective axes, to simplifymachining operations and realize a desirable economy in manufacturingcosts.

With the above and other subordinate objects in view, the inventioncomprises the novel tool holder construction and adjusting meanstherefor in the composite assembly to be hereinafter more fulldescribed, illustrated in the accompanying drawings and subsequentlyincorporated in the subjoined claims.

In the drawings wherein I have illustrated several simple and practicalembodiments of the present invention, and in which similar referencecharacters designate corresponding parts throughout the several views:

Figure 1 is a side elevation, partly in section, illustrating onepractical embodiment of my improved tool holder;

Figure 2 is a top plan view, certain parts being shown in horizontalsection, substantially as indicated by the line 22 in Figure 1;

Figure 3 is an end elevation of the tool holding member;

Figure 4 is a side elevation of the adjusting bushing;

Figure 5 is an end elevation thereof;

Figure 6 is a similar view of the opposite end of the bushing;

Figure 7 is a detail sectional view of the adjustable cam means formoving the tool holding member and bushing to'final set position withrespect to the'driving member; v

Figure 8 is a side elevation illustrating a simplifled embodiment of theinvention;

Figure 9 is a top plan view thereof, partly in horizontal section,substantially as indicated by the line 9-9 in Figure 8;

Figure 10 is an end elevation of the adjusting bushing shown in Figure8;

Figure 11 is a side elevation of the adjusting bushing;

I Figure 12 is a detail elevation of the key for the tool holdingmember; and

Figures 13 and 14 are diagrammatic views illustrating the adjustingaction of the eccentric bushing when the machine spindle and drivingmember are in and out of axial alignment respectively.

Referring in further detail to the drawings and for the present moreparticularly to Figures 1 to '7 thereof, and 22 generally designate thetool holding member and the driving or coupling member respectively. Thelatter comprises a shank 24 adapted to be secured to 1 a machine spindleor mounted in a chuck in the usual manner. One end of the shank 24 isprovided with a coaxial cylindrical coupling head 26 of enlargeddiameter, preferably integral with the shank. This head is formed with abore in axial alignment with the shank 24, having a section 28 ofmaximum diameter connected with a relatively narrow outer end section ofthe bore of reduced diameter to form the annular land 30. The other endof bore section 28 is connected with an axially spaced section 32 ofrelatively small diameter by the inwardly sloping or inclined annularwall 34. All cylindrical surfaces of this bore are substantiallyconcentric with the outer cylindrical surface of the coupling head 26. v

Adjacent to the juncture of head 26 with the shank 24 said head isprovided with a cylindrical opening 36 having its axis normal'to theaxis of shank 24 and in the plane thereof. The outer side portion ofthis opening intersects the inner small diameter section 32 of the borein the coupling head 26 for a purpose which will be presently explained.

The tool holding member 20 comprises an elongated cylindrical bodyportion 38 of uniform diameter, provided at one end and at one side ofits axis with an obliquely inclined or beveled face 40. A set screw is'provided for adj'ustably mounting a tool bit 42 in the body 38 with itsaxis disposed parallelto the beveled face40.

The other end of the body portion 38 of-member 20 is formed with afrusto-conicai portion 44 connected at its smaller end with an axiallyspaced annular endsection 46 by a reduced section 48 of uniformdiameter. Aprojecting lug or nose 56 extends diametrically across theend face of the section 46. This lug is of general wedge-shaped form andhas opposite faces 52 beveled or inwardly inclined from the end face ofthe lug toward the axis of member 28. The end face of the lug' isprovided with a groove 54 intersecting the inclined faces 52. p v

The adjusting bushing for the tool holding member 26 comprises a sleeve56 of redetermined length and. external diameter to. be rotativelyreceived within the coupling head 26. This sleeve atoneuof its ends isformedwlth a flange 58 concentric with the external surface of thesleeve and preferably knurled or milled as at 60 for facilitating thequick andeasy rotation of the sleevewithi'nthe coupling head. The

stance four of these slots are shown, spaced 90 apart, and they extendthrough the flange 58, terminating at their inner ends substantially atmid-length of the sleeve.

At its opposite end the sleeve 56 is formed with an external inwardlytapering or inclined annular surface 10 having an inclinationsubstantially equal to that of the bore section 34 of the coupling head26'. This end of the sleeve is also split by the narrow longitudinalslots 12 disposed in planes intermediate of the slots 68 and alsoextending from the free end face of the sleeve inwardly to substantiallymid-length thereof. By reason of this split construction of the bushingsleeve opposite end portions thereof between the slots 68 and [2respectively, may relatively expand and contract in re sponse to radialpressures in the final assembly of the members 28 and 22 in rigidlycoupled relation with each other in the mariner hereinafter described.

Complementary tubular camming members 14 and 16 respectively are adaptedto be slidingly fitted in the'opposite ends of opening 36 in thecoupling member 26. The opposed ends of these members are cut away orrecessed asat 18, for a depth substantially equal-to the radius thereof,one Wall 38 of each recess being disposed at an oblique angle to theaxis of the respective members, which substantially corresponds to theangle of one of the inclined faces 52 on the lug or nose 50' withrespect to the axis of member 20. Cam member 74 is internally threadedto receive the threaded end of an adjusting screw 82 extending throughthe other cam member 16. The latter member at its outer end is formedwith a countersink 84 providing a seat for the tapered head 35 of theadjusting screw. The screw head is provided with an axial recess 88 forthe application thereto of a suitable wrench.

Upon the outer surface of the coupling head 26 at its open end, a scaleSill is engraved or otherwise delineated in predetermined or selectedterms of measurement indicative of the different diametrical settings ofthe tool bit 42 and is readable with respect to the index line 92 on theperiphery of the bushing flange 58.

In the initial assembly of the above described parts, the eccentric'allybored bushing 56 is first applied over the end of the tool holdingmember 26 and the two parts then inserted into the coupling head 26,with the flared end 64 of bushing bore 62 in contact with thefrusto-conical section M of member 20 and the'external tapered surface10 of the bushing in contact with bore seccam surfaces 80 of saidmembers and the inclined faces 52 of the terminal lug 5 0 on member 20,the

groove 54 thereof embracing the adjusting screw.

bore 62 of the sleeve eccentrically' drilled therethrough with respectto its outer surface and flange 58, andat the latterend of the sleeve isoutwardly flared or of' progressiv'ely increasing diameter to provide anannular surface 64 of substantially the same width and inclination asthe peripheral surface of the section 44 of the tool holding member 20.i

Preferably the sleeve at its juncture with flange 58 is provided withan-vexternal circumferential groove 66 and thislend-of the sleeve issplit-by the narrow longitudinal slots 68. In the present in- Afterfirst adjusting the tool bit 42 in the holder for a trail cut the flange58 is grasped and bushing 56 rotated between the wall'of coupling head26 and the tool holding member 20 until index line 92 registers with oneof the graduations of scale 90 denoting a predetermined diameter of thebore or other surface to be out upon the work by the tool bit 42. Sincebore 62 of the bushing is in eccentric relation to the axis of couplingmember 22, the member 20 and tool bit 42 will thus be radially displacedinwardly or outwardly relative to said axis and the axis of the workpiece. As shown by the scale reading in Figure 1 the tool 42 has beenadjusted for cutting a maximum diameter bore and it will be evident fromreference to Figure 5, that by rotating the bushing through 180 in aclockwise direction from the positio'nshown in Figure 1,

20 against rotation with or independently of the bushing relative to thecoupling member 20. Such rotation would introduce an additional lateraldisplacement component of the tool 42 relative to the machine spindle sothat the actual setting thereof would not accurately reflect the borediameter reading on scale 90. This inaccuracy of the tool setting wouldbe seriously multiplied when the axis of the coupling and driving member22 is not in exact alignment with the axis of the machine spindle, aswill be later explained in connection with Figures 13 and 14 of thedrawings. It will also be observed that in the adjustment of member 20with respect to couplin head 26 the members 14 and I6 with adjustingscrew 82 will be axially moved as a unit in opening 36. Groove 54 is ofsuflicient depth to permit displacement of nose or lug 50 diametricallyof the screw 82 in the displacement of tool holder 38 by the bushing 56.

After the adjustment of bushing 56 to position tool 42 at the desiredborev diameter as above explained, screw 82 is then. adjusted to movethe members I4 and I6 inwardly, toward each other. The cam surfaces 80of these members, coacting with the inclined surfaces 52 on lug 56,impart a unitary inward axial movement to the tool holding member 20 andbushing 56 relative to coupling head 26 It will thus be evident that thepressure engagement of tapered surface on the bushing with inclined wallsurface 34 of the coupling head causes an inward radial contractingpressure upon the parts of the inner end of the bushing between thespaced slots I2, while the part, of tool holding member coacts Withtheflaring or inclined end surface 64 of the bushing bore 62 tooutwardly expand the other end sections of the bushing between thespaced slots 58. Thus the latter end sections of the bushing areradially expanded into tight binding contact with the annular land oncoupling head 26,. and substantially at the same timegthe i ner-,- endsections of the bushing are radially'contracted into tight bindingengagement with the annular part 46. upon the end of member 20. In thismanner a rigid frictional coupling-betweenthe driving member 22, bushing56 and tool holding member 20 is produced, which efiectivelyzprecludescasual rotation of the bushing relative .to members 20 and 22 from itsadjusted position, which might result from vibration or other causes. Itwill also be noted that this frictional coupling will not be disturbedby driving torque stresses since the driving torque is transmitted tothe tool holding member 20 principally through the members "I4 and 16,which rigidly lock the member '20 against rotation in coupling head 26,independentlyof the bushing 56. u a

Fromthe above it willabe seen that this embodiment of my inventionprovides an eccentric adjusting bushing for the tool holding member ofnovel construction, whereby the tool may be quickly and accuratelyadjusted to a predetermined set position relative to the axes of thedriving member and spindle, and that said bushing is frictionallycoupled at axially spaced points with the driving and tool holdingmembers. The two part torque transmitting key I4, I6 also serves afurther purpose as the means for effecting the frictionally coupledrelation between the bushing and the driving and tool holding members.

In Figures 8 to 12 of the drawings, I have shown a somewhat simplifiedembodiment of the invention. In this construction, the cylindrical shankor body of tool holding member 94 has a cylindrical conical end portion96 progressively increasing in diameter from a threaded section 98 ofsaid member to the end face I00 of part 96 which is provided with adiametrically extending groove I02 therein having parallel opposite sidewalls and an arcuate base I04.

The other end of the member 94 is provided witha diagonal opening I06intersecting the axis of said member at an angle of substantially 45.This opening adjustably receives the tool bit I09 which is rigidly fixedtherein in its adjusted position by means of the set screw IIO;

In this construction the coupling head II2 on the end of driving memberII 4 is comparatively short and the inner and outer surfaces of itscylindrical wall are of uniform diameter throughout their length andparallel with the axis of said driving member. At its inner end, thecoupling head is provided with the diametrically extending opening H6 toslidingly receive a one-piece torque transmitting key or pin H8. Thispin is of general E-shape form, having the longitudinally spacedrecesses I20 in one side thereof forming a central semi-cylindrical lugI22 which is adapted to be snugly received between the parallel sidewalls of the recess I02 in the conical end 96 of tool holding member 94.It will be noted that the base wall of the recess I02 is of considerablygreater radius than the lug I22 and permits the member 94 to moveradially in the coupling head relative to the key lug I22.

The adjusting bushing I24 for the tool hold ing member 94 has aneccentric bore I26 which progressively increases in diameter from theouter face ,of the end flange I28 on the bushing to the opposite endthereof, the taper or inclina" tion of said bore being such as to havenormal snug fitting contact'upon the cylindrical surface of the'jconicalend 96' of member'94 throughout its length. As seen most clearly inFigure 11 of the drawings, the wall of the bushing and the flange I28thereof are longitudinally split at a single point by the slot I30extending throughout the length thereof. After the bushing has beenapplied to the conical end 96 of member 94, a nut l32-is engaged withthe threaded section198 of said member for hearing contact againsttheface of ,the bushing flange I28. As herein shown this nut is providedwith spaced radial recesses I34 to receive the spaced parts of aconventional spanner wrench.

In assembling the above described parts, in this casethe key pin H8 isfirst inserted in the opening I I6 of the couplinghead. The conical end96 of member 94 and the bushing sleeve are theninserted into saidcoupling head, the sleeve at its. outersurface having normal snugfitting engagement with the inner surface of the wall of the couplinghead; The large end ofthe part 96 and the corresponding end of thecoupling sleeve project into the spaced recesses I20 of the key pinwhile the lug I22 on said pinis slidingly received in the recess IIl2.Thus in the rotative adjustment of the bushing with respect to thecoupling-head and part v 96 of the member 94 to diametrically set toolI08 with re spect to the coupling head for a predetermined diameterbore, while the key lug I22 will eiiectively prevent rotative movementof the member 94 said member may have free radial movement in alldirections with respect to the coupling head. After the adjustment hasbeen made, the nut I32 isthen tightened against the end flange I28 ofthe bushing to force said bushing axially on the tapered end 96 ofmember 94, thereby expanding said bushingthroughout its length andtightly binding the same against the cylindrical surfaces of part 96 andthe inner surface of the wall of the coupling head to frictionally lockthe bushing against rotative movement from its adjusted position. Inthis case, also, the driving torque will betransmitted to member 94 bythe key lug I22 independently of the bushing I24.

Referring now to the diagrams of Figures 13 and 14, which are equallyapplicable to both of the above described embodiments of the invention,in Figure-13 the axes of the work piece, the driving and couplingmemberand the machine spindle are in accurate alignment; ,However, inpractice when the driving and coupling member is connected to themachine spindle it often happens that due to burrs, dirt, worn surfaces,imperfect fitting of the shank of thedriving member in or on thespindle, or other causes, the axis of the shank is not in perfectalignment with the axis of the machine spindle. In such case, no matterhow accurately an eccer'itricallyv adjusted tool holder may bemanufactured, if in making the adjustment, the tool holding member isrotated about its own axis relative to the axis of the driving andcoupling member, then the adjustment correctly reflects the scalesetting only with respect to the latter axis and is incorrect with therelation to the axisof the machine spin dle.

In these diagrams, the tool settings T I T--2, and T3, correspond to themaximum, intermediate and minimum bore diameters B- -I B-2 and B--3,respectively, which are concentric to the machine spindle axis S. Thesetoolsettings are produced by movement of the eccentric center of theadjustable bushing to positions El, E-2 and E-3 respectively in the pathPabout the axes of the driving and coupling member and the spindle. u

In Figure 14 axis D of the coupling'member is shown out of axialalignment with the spindle axis S. Of course, the displacement isgreatly exaggerated in the drawing, as in'actualpractice it seldomexceeds a fractional thousandth of an inch. Since, in the presentinvention the tool holding member is positively locked againstindependent a'xial rotation, said holder and the cutting tool will bediametrically adjusted relative to the spindle axis in the movement ofthe eccentric bushing between the positions E'I, E-2 and E -3 tosubstantially the same respective positions indicated on the scale 90;when the spindle and driving member are cut-of alignment as in Figure 14and when they are in axiaIalignment as in Figure 13. It is apparent thatin Figure .14, ,ii the tool holding member also rotates about its ownaxis, a large error factor would be introduced in the setting of tool30, since an additional lateral displacement of the tool relative to thespindle axis would occur as the eccentric center of the bushing is movedin the path P, so that the final setting of the tool would notaccurately reflect the reading on scale 90.

From the above descriptiomit will be seen that I have provided a verysimply constructed tool holder and. adjusting means therefor, wherebythe cutting tool may be quickly set with a high degree of accuracy to apredetermined boring diameter with respect to the machine spindle,

regardless of exact alignment between the driving and coupling memberand said spindle. It will also be noted that the tightening or lookingpres-' sures between the tool holding member, the eccentric bu'shing andthe coupling member are pro duced entirely by means of axial thrustforces, thereby obviating the, tendency to disturb the adjusted settingof the i061 which would be incident to the application ,of such forcesin an angular direction relative tofthe axis of the tool holder. Thepositive and direct transmission of driving torque through the,s'hiftable key to the tool holding member independently of theeccentric bushing, ,is also an important feature of the invention, sincethepos'sibility of rotational movement of the bushing, or loosening ofthe coupled connection between the tool holding member and the drivingmember is thereby eliminated. In view of the simple structural form ofthe several parts, machining operations are simplified and they can beproduced with extreme accuracy to thus obviate lost motion in thecoupled connection, and disimrbance of the adjusted setting of the tool.

The invention may be embodied in other specific forms without departingfrom the spirit or essential characteristics thereof. The presentembodiments are therefore to be considered in all respects asillustrative and not restrictive, the scope of the invention beingindicated by the appended claims rather than by the foregoingdescription, and all changes'which come within the meaning and range ofequivalency of the claims are therefore intended to be embraced therein.

What is claimed and desired to be secured by United States LettersPatent is:

1. In an adjustable tool holder, a coupling member having a shankprovided with a cylindrical coaxial socket at one end; a tool holdingmember and an eccentrically bored longitudinally split bushing assembledtherein within said socket, said bushing being rotatively adjustable todiametrically position's aid tool holding member relative to the axis ofsaid coupling member, the i001 hdl'cling' member and the bushing havingopposed axially tapered surfaces constructed to"frictio'r'iallycoact inresponse-to axial movement of the" bushing in one direction to radiallyexpand said bushifig and rigidly couple the tool holding member inadjusted position to said coup'ling member; and manually operable meanscomprising adjustable cam means mounted in the coupling 'meniber andcoacting with terminal means on the tool holding member for exerting anaxial thrust force upon said bushing to axially move said member and thebushing into the :oc'ket of the coupling member to coupling posi- 2. Inan adjustable'to'ol holder, a coupling member having a shank providedwith a cylindrical coaxial socket at one end, a tool holding memberhaving an-"axially tapered concentric part of progressively increasingdiameter, a longitudinally split adjusting bushing provided with aconcentric exterior and an eccentric bore hav ing an 'iaiidally "taperedwall contactin az aid tapered part of-thetoolholding -member and anexternal surface concentri'c with and snugly fitting within said socket,said bushing being rotatively adjustable between the socket and toolholding member to diametrically position the tool holding memberrelative tothe axis of "thej coupling inemben-and additional inanuallyoperable means for applying an axial thrust force to re1atively movesaid contacting tapered parts of the bushing and tool holding member andexpand said split bushing into frictionally locked engagement with thecoupling and tool holding members to retain the latter in its adjustedposition.

3. The adjustable tool holder as defined in claim 2, wherein saidmanually operable means comprises a member adjustably coacting withmeans on said tool holding member to impart relative axial movement tosaid member and the bushing.

4. The adjustable tool holder as defined in claim 2, wherein saidmanually operable means comprises adjustable cam means mounted in thecoupling member and coacting with terminal means on the tool holdingmember to axially move said member and the bushing into the socket ofthe coupling member.

5. The adjustable tool holder as defined in claim 2, together with meansmounted in the coupling member for angular movement relative to its axisand coacting with means on said tool holding member to prevent axialrotation thereof in the independent adjustment of said bushing.

6. In an adjustable tool holder, a coupling member having a shankprovided with a cylindrical coaxial socket at one end, a tool holdingmember and an eccentrically bored bushing assembled thereon within saidsocket, said bushing being rotatively adjustable to diametricallyposition said tool holding member relative to the axis of the couplingmember, the wall of said socket, the tool holding member and the bushinghaving surfaces constructed to frictionally coact in response to axialmovement of the bushing in one direction and rigidly couple the toolholding member in adjusted position to said coupling member, a pair ofcam members movably mounted in the coupling member coacting with aterminal part on the tool holding member to restrain the latter againstindependent rotation in the adjustment of the bushing, and adjustablemeans connecting said cam members diametrically movable as a unit withsaid members and tool holding member relative to the coupling member andoperable to relatively adjust said cam members in effective engagementwith said part to axially move the tool holding member and bushing tocoupled position within said socket of the coupling member.

7. In an adjustable tool holder, a coupling member having a shankprovided with a cylindrical coaxial socket at one end, a tool holdingmember and an eccentrically bored bushing thereon within said socket,said bushing being rotatively adjustable to diametrically position saidtool holding member relative to the axis of the coupling member andlongitudinally split at its opposite ends to provide axially spacedrelatively expansible and contractible end portions, said eccentric boreat one end of the bushing progressively increasing in diameter, saidtool an an "its-adjusted position to i e memh r ,liavina a, co cent c ts -v conica part" "nt 't gfsaid endfoff' the bore, the other, ,e d "ofjthe bushing havingj-"an fexternal annular 1' aperirfig surfacecontacting {an internal tapering n said socket, and 'manuallyoperablefmeanjs r axially urging the) tool holdi ml beaa u h ain csaidyd e tract" said-bushing at its latter end to alfbi'ndingpngagement withthe tool ht'al'ding member and'toexpandth"other end of the bushing intobinding engagement with-the socket wall and thereby frictionally couplethe tool holding memsaid coupling member. I

8. The adjustable tool holder as defined in claim '7, wherein saidmanually operable means comprises means coacting with a part on the toolholding member to restrain the latter against independent rotation inthe rotative adjustment of the bushing.

9. The adjustable tool holder as defined in claim 7, wherein saidmanually operable means comprises a pair of relatively adjustable cammembers mounted in the coupling member and directly coacting withterminal means on the tool holding member to restrain the latter againstindependent rotation and transmit driving torque from the couplingmember to the tool holding member independently of said bushing.

10. In an adjustable tool holder, a coupling member having a shankprovided with a cylindrical coaxial socket at one end, a tool holdingmember having a portion progressively increasing in diameter to one endof said member, a longitudinally split adjusting bushing having aneccentric tapered bore assembled on said end portion of the tool holdingmember and an outer surface concentric with said socket and snuglyfitting therein, said bushing being rotatively adjustable todiametrically position the tool holding member relative to the axis ofthe coupling member, and manually operable means carried by said toolholding member, and coacting with the bushing to relatively move saidmember and bushing axially in opposite directions and radially expandthe split bushing to frictionally couple said tool holding member in itsadjusted position to said coupling member.

11. The adjustable tool holder as defined in claim 10, wherein saidmanually operable means comprises a nut threaded on said tool holdingmember in adjustable engagement with the outer end of the bushing toaxially move the bushing into the socket upon said end portion of thetool holding member.

12. The adjustable tool holder as defined in claim 10, together with atorque transmitting connection between the coupling member and toolholding member embodying means restraining said tool holding memberagainst rotation with or independently of the bushing relative to saidcoupling member.

13. The adjustable tool holder as defined in claim 10, together with keymeans mounted in the coupling member coacting with means on said toolholding member constructed and arranged to permit relative movementbetween said key means and tool holding member substantiallydiametrically of the coupling member while preventing axial rotation ofsaid tool holding member with respect to the bushing and couplingmember. s

14. The adjustable tool holder as defined in claim 10, together with apin mounted in the coupling member and having a key lug, said end f saigqr loa 9 th z ql. h ldii g memb r havip .19? hwia i p wd sub tantial ygormal tq t e axis 9. Pin and in. whim iai k u is 9.- bly eaa ed, t rtra n th ta h min m m a fiinfit i d ndent a a rqta ion and, permi rlaive an i ar mq emam b twe n id to hq li memb @1451 t n wi res ect o. he

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file of this patent:

Number Number Dam June 20, 1911

